Spur-gearing.



vK. LQUIST. I SPUR GEAHING.

APPLlcAloN FILED www. 1911.

' Patented June 1, 1915.

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' Relating- 'substantial component o KARL ALQUIST, OF RUGBY, EN i l SPUR-GEARN G.

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Specification of ietters Patent.

Patented Imre 15.5v

Application aledaulym, 1911. seriaino. 639,211. f

To albwhom, it may concern .1

Be it known that I, KARL ALQUIsT, a sub#- ject of the King of. Sweden, residing at 147 Clifton road, Rugby, in the county of Warwick, Kingdom of lEngland, have invented' certain .new andi usetul Improvements in or to Sp'ur-Qearing, of which the followin is a specication.l v y My invention relates to spur gearing, and has-for its object' to insurea certain yielding or flexibility under pressure of the teeth of such gearing. In order to obtain this result I use 'a wheel rim, or a pinion, built up from a plurality of comparatively thin plates or laminations, made of practically incompressible material, and my invention broadlyconsists in having the teeth so formed or cut in the plates or laminations as to enable the plates'or laminations to yield or bend elastically at right angles to their planes under the tooth pressure, for the resultant purpose ofproducing an elastic yielding of the surface of the teeth in mesh under the tooth pressure in the direction of rotation. The teeth are formed or cut helically or in an oblique direction across the laminations, and' I use preferably an angle not over 709, a's measured between the direction of the teeth and the planes of the plates, in order to get a substantial component of the toothy pressure to effect the yielding of the. plates or laminations and, at the s me time, to get a.

the plates. or laminations to produce the yielding of the surface of the. teeth under pressure in the plane of rotation.

My invention is illustratedin the accom- .panying drawing, forming part of this speciication in which- Figure 1 is a developed surface oli a. laminated gear; Fig@ is an axial section of onehalf of the gear; Fig. 3 is an enlarged transverse section'of one-fourth of the gear'showing undercutting of teeth; Fig. 4:' is an"en largedaxial section of my gear with the laminations arranged in` groups; Fig. 5 is a fragmentary elevation showing segmental laminas; Fig. 6 is a fragmentary longitudinal section of a slight modification; and Fig. 7

is a longitudinal section of another modification.

I'n Fig. 1, I have shown in developed plan the general principle of the invention as described above. A cylinder built up from plates o r laminations (only part of the surface being shown) has teeth cut in an oblique en across these laminations. The parthe yielding of' allel lines a indicate the top,fand the space between. the lines b the foot of the teeth. In carrying out my invention I preferably place the plates or. laminationseither in. planes inclined to the axis of the gear wheel or at right angles to the, axis, and cut helicalteeth out of the rim thus built up. rl`he Figs. 2 to 7 show -thelatter method which is more con-` venient. in practice for holding the plates.

In Fig. 2, I have shown a pinion built up from aA number of plate rings c, and firmly clamped and compressed on the shaft between two stiffer end plates d. Keyways may be cut inthe plates, so as to well lit keys in the shaft or center piece, andthe teeth may thenbe milled out helically. In order to give more flexibility the teeth may be cut or milled out longer than would otherwise be necessary. This is. indicated in 'Fig 3, which showsV a cross section of the pinion. The plates may, after the teeth have been cut., again' be taken apart and the thickness of the plates, where forming the teeth, be somewhat reduced so that finally theplates may be well tightened up in the center with- ,lment is shownv in Fig. 4, whereeachgrou consists of a single lcomparatively thic spring vplate of sulicient radial width to yield. or bend sidewise in spite of this thickness. Between the`plates are .inserted the distance plates f. I may also use several plates or laminations, constituting a group between the distance plates f, as indicated in Fig. 6. Here the distance plates are of con- -siderable thickness and increased flexibility is obtained by machining out peripheral grooves in the plates as shown, in order not to have to take apart and disturb the plates after the teeth have been cut. To retain thisadvantage, I may also make up the distance plates f of, two. concentric rings or laminations, the vouter one, supporting the teeth l `during the milling operation, being of destructible material for Ainstance pap, so

t'o the width of the end plates d flexible by machining them down, after the teeth have been cut, to the shape indicated inFig. 6.

It is generally better for the-smooth run-- ning to have the driven wheel, which asa rule is the larger one, provided with the flexible teeth when only one ofthe wheels in mesh is built up according to this invention, and for large wheels it may be nec essary to build up the laminations or yplate rings insections or segments so asto form a cylinder, and I may then secure the lam1- nations byymeans of bolts or rivets passing through the sections or segments, which are 4suitably staggered, and the two endplate rings. This arrangement is shown in Figs. 5 and-6. In order to make the 4built up vring sections or segments absolutely unyielding in a, radial direction from centrifugal stresses, care should be taken to have the holes 'g properly reamed out, so as to well fit the bolts or rivets L, andthe center should be provided with a slight taper, or some similar arrangement, so that the segments will be held perfectly tight when drawn up by the bolts li, or the laminated ring or cylinder may be`shrunk on to its center.

I do not claim herein' the method .of manufacturing elastic helical gears involving the use of a removable or destructible spacing device, because this forms the subject matter of my divisional application," Serial No. 819,480, filed-February 18, 1914.

What I claim as my invention and-desire to secure' by Letters Patent in the United States `is y 1. A gear wh'eelhaving a body portion built up of .a plurality of perpherally toothed plates -securely bound together at their centralV portions and with the outer portions unbound'and slightly spaced apart so as to be free to yieldat right angles t`o the planes of the plates, said plates beingofsubstantial thickness as compared to thel vwidth of the space between them.

. 2. A gear wheel having a. body portion .built-'up of a plurality of plates rigidly supported at. their central portions only, and slightly spaced apa-rt at their peripheral portions, and helical teeth formed in the periphery ofpsaid body portions, said plates being of substantial thicknesses as compared space between them. 3. A gear-.wheel having a-body portion built up of a plurality of plates rigidly sup- 'ported at their central portions only, and --slightly spaced apart at their peripheral portions, andy helical teeth formed in the periphery of said body portion, said plates beingof substantial thickness as compared to the width of the space between them, and said teeth being longer than necessary to increase their llexibility.

4. A gear wheel having a body portion built up of a plurality of plates rigidly supported at their centralportions and spaced apart at their outer portions, said 'plates being of substantial thickness as compared to the width of the space between them; and helical teeth formed in theperiphery of said body portion.

5. A 'gea'rwheel comprising a plurality of 80 i circular laminations, space plates and end plates of less diameter than the. laminations, said laminations being of substantial thickn ness as compared to the thickness of the spaced plates, means for rigidly clamping said laminations, space plates and end plates together, and helical teeth formed in the periphery of said laminations. f

6. A gear wheel having a body portion Abuilt Vup of a plurality of tooth plates securely bound together at their centralportions and with the toothed portions unbound and free toyield at right angles to i the planes of the plates, and elastic spacing devices between plates.

7. A gear-wheel having a body portion built up of a plurality of plates securely bound together -at their'central portions with their peripheral portions spaced apart so as to be free to yield at right angles to the planes of the plate, said plates being of substantial 'thickness as compared to the width of the space between them. and helical 'gearteeth'formed in the peripheral portions of said plates, a portion of the body of each plate between the teeth and below their roots being cut away to increase the elasticity of the teeth in the plane of the plate. 4

8. A gear wheel having a body portion built up of a plurality of tooth plates -arranged in groups securely bound together ,at their central portions and with thetoothed portions ufhbound and spaced r slightly apart so as t be free to yield laterally of the planes o the plates. a spacing port on which the are mounted.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses this sixth day of Julv, 1911. f

KARL ALQUIST. Witnesses:

MARGARET B. PAXTON, AX. BREMBERG.-

vdevice between each wo groups, and a suppates 4and spacing device -n Letters Patent No. vi ,t4 ,092,A

It is hereby certified that in Letters Patet No'. 1,141,097, gran June I, 1915, upon the application ofKarl. Adqmxisst,v of Rugby, Engllnd, for* an improvement in4 I Spur-Gearing? :an error appears in the printedwspecication requiring correctiorl as flowsf'Pag-Z lihaAQ, fgrthe Word thiknesses read thickness; 3nd' that thersid Lttrs Patent should be read Withth's, correction tbr'ein that the sama may conform to the record Gf the cas@ inthy Patent l signednd seared this 27th m 0f July, A., D., 1.915,.

{SEAL} R., r. www;

Acting" Commissioner of Patents.

Ema

Street 

